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Finding the Fourth Proportional to 942.96, 1,408.09 and 769.96

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Solution

The fourth proportional to 942.96, 1,408.09 and 769.96 is: 1,149.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.96 : 1,408.09 = 769.96 : x
  2. Step 2: Convert to fraction form
    942.96/1,408.09 = 769.96/x
  3. Step 3: Cross multiply
    942.96x = 1,408.09 × 769.96
  4. Step 4: Simplify right side
    942.96x = 1,084,176.19
  5. Step 5: Solve for x
    x = 1,084,176.19/942.96
  6. Step 6: Final answer
    x = 1,149.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.